I figured that this would be something worthwhile to add to the boards, considering a few boost guys have complained about eradict idling. The problem is often due to a dirty idle control valve, located on the underside of the throttle body.
It's pretty basic stuff, nothing difficult. Begin by removing the misc. electronic plugs from the throttle body. Remove the two bolts and two nuts, then pop the throttle body off. Turn it over, and you'll see the IAC valve bolted to the underside of the TB. Remove the screws, then remove the electronic portion of the valve. After it's removed, soak the valve with non-chlorinated brake cleaner and work the valve back and forth to clear the build-up. I'd let it dry for at least a day (might be overkill, but oh well, I've got the garage to leave the car in), then reinstall.
I haven't cleaned the valve yet, but will post pics tomorrow night to show a before & after.
Here are the pics:
_Underside of the throttle body, with the IAC valve removed:
_IAC valve removed. Notice the electronic portion that should be removed prior to spraying:
_The build-up around the IAC valve:
_Shot with the electronics removed. The valve has a magnetic end:
